Splicing and terminal device for fire detecting cables



May 19, 1931. w. D. LlNDsEY SPLIGING AND TERMINAL DEVICE FOR FIREDETECTING CABLES Filed June ll, 1927 BY ATTORNEY Patented May 19, 1931UNITED STATES;

PATENT oFFicE WILLIAM DALES LINDSEY, F SOUTH ORANGE, JERSEY, ASSIGNORTOGARRISON FIRE DETECTING SYSTEM INCORPORATED,VOF NEW YORK, N. Y.

SPLICING .AND TERMINAL DEVICE lFOR FIRE DETECTING CABLES Application ledJune 11,

This invention relates to a splicing and connection terminal device fora lire detecting cable adapted to quickly, safely and neatly unite theends electrically of a conducting core and a conducting insulatedsleeve, respectively, the same constituting a special design of firedetecting cable. A

modication thereof is adapted to unite an electrical conductor quickly,safely and neatly to the aforesaid conducting core and anotherelectrical conductor to the aforesaid conducting insulated sleeve.

lVith these and other objects in view, which will become apparent as thepresent ldescription proceeds, my invention consists of the novel partsand combinations of parts, all as hereinafter will be more fullydescribed and particularly pointed out in the claims. In a copendingapplication for U. S. Letters Patent, filed Julie 11, 1927, under theSerial No. 198,056 there is disclosed an improved design of firedetecting cable adapted for use with the splicing and terminalconnection devices illustrated and described in the present patentapplication.

Referring to the accompanying drawings forming a part of thisspecification in which like numerals designate like parts in all theviews.

Figure 1 is a top plan view of one design of one of my special liredetecting cable splicing devices in association with a pair of cableends, which are cut back and prepared for splicing.

Figure 2 is an enlarged section of this device in association with oneof my lire detecting cable ends cut through as on the line A. B. ofFigure 1.

Figure 3 is an enlarged section of this device in association with apair of my special cable ends cut through on the line C. D. of Figure 1.

Figure it is a top. plan view of a simplified device in association witha cable end, and

two insulated wires adapted to secureelectrical conductors to the coreand insulated sleeve respectively of my lire detecting cable.

Figure 5 is a short length of a piece of 1921; serial No. 198,057.

the lire detecting cable partly `in elevation and partly in section,showing the several co-opera'ting parts of the special cable.

Figure G is a vertical sectional view of the cable. f

In the drawings, 1() .is the outer braid of a piece ofmy cable; 10c is awater proofing cover; 11 is a spirally wound strip of conductingmateriahbrass for example; 12 is an insulating impregnated material,cotton parafiined for example; and 13 'is a slotted tube of metal, softsteel for example, containing a low melting point fusible alloy 13a, analloy of lead, tin, and bismuth for example, shown in the slot 14.y 15is an insulating member, made of moulded material, porcelain, bakelite,or vulcanite for example,'provided with the hole 16, and 16 adapted toreceive screws for attachment to woodwork or other building material; 17

and 17 are U-shaped aligned and substan-v tially parallel metal clampsadapted to be securely screwed to the U-shaped metal conducting bridge1S by the screws 20, 20, 20, 20. The braidl 10 is cut away under theclamp member 17 and 17 allow ing them to make contact with the spirallywound brass conductor 11, thereby completing an electricalcircuitthrough the conductingbridge 18. f

At substantially the center of the insulating member 15 is a third metalclamping member 21, iny alignment with and substantially parallel to theouter clamps 17, 17, the clamp 21 being securely screwed down to Vasimilarly shaped metal base piece and to the insulating member 15through theagency of the screws, 22, and 22` and adapted to unite thecores of my cable extremities, namely the slotted steel tube .containingthe fusible alloy. The clamp 21 and its asso ciated metal base piece'arereadily seen to occupy the space between thevparallelly disposedbranches of the bridge 18 and spaced therefrom to avoid electricalconductivity.

Referring to Figures 2 and 3,`like partsv may be easily identified andtheir'functions made clear', from the foregoing description.- In Figure4, is shown a modification of the so g clamping device wherein both theslotted core and the spirally wound conductor 11 are each joined to anordinary insulated wire such as represented at 25, 25. This form ofconnection is particularlyV useful at the limits of an electricalsection subjected to lire hazards.

Referring to Figure 5, the like parts may be clearly identified and thefunctions of each made clear in connection with the followingdescription. My fire detecting cable is run throughr a building, and isconnected and spliced with the approved deviceherein described, and isconnected with electric bat-.

tery and bell, the core and sleeve respectivecore being substantiallysmaller in cross section than the passage receiving said sheath. Signedat` New York city in the county of New York and State of New- York thisseventh day of J une A. D. 1927. Y

WILLIAM DALES LINDSEY.

ly,to leave the circuit open so long as there is no fire and the fusiblealloy remains in the slot 14 of the tube 13. lVith fire, however in thepath of the cable, 'the fusible alloy melts, passes through the strands.of the cotton insulating materialy 12, and contacts with the brasssleeve 11, thereby com-` ingfdisposed in spaced relation, of meansV Thefor electrically connecting said coresv and Y sheaths independently ofeach other, said` means comprising a supporting member of isulatingmaterial, spaced' U-shape'd clamps contacting, respectively, directly.with said sheaths and carried by said supporting member, another clampcontactingdirectly with said cores and carried by said supportingmember, the sheath 'openingsofsa'idf spaced clamps being lar er incross-section than the core opening o said other clamp, and meansconstituting an electrical connectionbetween said spaced clamps.

2. The combination with a cable comprising an electricity-conductingfusible core! projecting beyond an electricity-conducting sheathnormally insulated therefrom, of means for effecting independentelectrical connection with said c'ore and sheath, said means comprisinga supporting member, and

spaced U-shaped clamps disposed on saidA member in side-by-siderelation, one of said clamps forming a passage for the reception of saidsheath, another of said clamps forming a passage for the reception ofsaid core, said passages being disposed substantially in alinement andthe passage receiving said

